Fix an improper usage of empty() in the URI class
diff --git a/system/core/URI.php b/system/core/URI.php
index 72f293c..13530bd 100644
--- a/system/core/URI.php
+++ b/system/core/URI.php
@@ -219,7 +219,7 @@
 			$_GET = array();
 		}
 
-		if ($uri === '/' OR empty($uri))
+		if ($uri === '/' OR $uri === '')
 		{
 			return '/';
 		}